| 张北6.2级地震前京西北地区地震波速比的异常变化 |
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| 引用本文： | 刘继禄,张从珍,李雪英,杜迎春,董孝平.张北6.2级地震前京西北地区地震波速比的异常变化[J].地震地磁观测与研究,2000,21(1):6-11. |
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| 作者姓名： | 刘继禄 张从珍 李雪英 杜迎春 董孝平 |
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| 作者单位： | 中国石家庄,050021,河北省地震局 |
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| 摘 要： | 对张北62级地震前京西北地区地震波速比的时空分布特征进行了分析,发现62级地震前,该地区波速比时空分布都出现了较明显的低值异常:下降—低值—恢复—下降—发震的过程。空间分布则为近似椭圆形的低值异常区,异常区外围地区地震平静。对计算结果进行了t检验,波速比的时空变化及t检验结果表明,62级地震前京西北地区地震波速比存在着比较明显的低值异常。
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| 关 键 词： | 京西北地区 波速比 张北地震 低值异常 |
The abnormal change of wave velocity ratio in northwest of Beijing before Zhangbei 6.2 earthquake |
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| Liu Jilu,Zhang Congzhen,Li Xueying,Du Yingchun,Dong Xiaoping.The abnormal change of wave velocity ratio in northwest of Beijing before Zhangbei 6.2 earthquake[J].Seismological and Geomagnetic Observation and Research,2000,21(1):6-11. |
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| Authors: | Liu Jilu Zhang Congzhen Li Xueying Du Yingchun Dong Xiaoping |
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| Institution: | Liu Jilu,Zhang Congzhen,Li
Xueying,Du Yingchun and Dong Xiaoping
(Seismological Bureau of Hebei Province,Shijiazhuang 050021,China) |
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| Abstract: | We analysis the time space change of wave velocity ratio in northwest of Beijing before Zhangbei 6 2 earthquake,and find that there is an obvious change,this process includes decline,low value,comeback,decline and happen.The abnormal area in space spread is a ellipse area,and there is a placidity outside the abnormal area.At the end,we check up the statistical result through t test,the result of the abnormal change of wave velocity ratio indicates that there is obvious abnormal low value of wave velocity ratio in northweat of Beijing. |
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| Keywords: | northwest of Beijing wave velocity ratio Zhangbei earthquake low value abnormal |
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